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I just want to know the reason of these errors ? im not sure may be there is some problem in DBSEO ?

this is my webmaster seo report obtain from dbseo . there are many errors and my website is not properly coming up on google and crawl is almost dead. please tell me how to fix below errors im so worried 404 Not Found" Errors 6,841 "Not Followed" Errors 0 "403 Access Denied" Errors 4,036...